[asterisk-users] modem through Zaptel/Digium?

[Greg Woods]

This is just a low priority curiosity question because I have a usable
workaround.

I have  Digium card that uses the Zaptel driver (can't get to my home
machine right now to get the exact model, but it probably doesn't
matter). It's a card with one POTS line and three extension hookups. I'm
using Asterisk 1.4 and Zaptel 1.4.7 . 

One of the extension ports is connected to a modem on another computer.
This is a FAX modem that works well; I have * programmed to detect
incoming faxes and route them to this modem, and it works seamlessly. I
can also send outbound faxes with no problem.

The curiosity is that this modem does not work for dialup unless I
bypass the * server and connect it directly to the wallplate, then it
works fine. I don't see why it would be able to detect carrier and
negotiate with a fax machine through * and Zaptel, but not with a dialup
server.

--Greg